How much flood risk does St. Joseph County actually carry?
St. Joseph County lands at the 85.4th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 2 years. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Mandatory flood insurance compliance in St. Joseph County
Out of 611 homes FEMA counts inside St. Joseph County's mapped flood zone, 111 carry the flood policy federal law requires there — 18.2% compliance, short of full coverage. Across all residential structures in St. Joseph County, not just the ones FEMA mandates, 0.2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How St. Joseph County compares nationally
St. Joseph County sits at rank 482 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 268 of 3144 by population (1 is biggest). St. Joseph County, Indiana covers 457.781 square miles and counts roughly 273,744 residents.
Your street may differ from St. Joseph County's average
Across all of St. Joseph County's 97,233 residential structures, 232 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed St. Joseph County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.